Drill chuck with spring-loaded collet



July 28, 1959 v HLVERMETI'E 4 2,896,957

DRILL CHUCK WITH SPRING-LOADED COLLET Ofiginal Filed April 2, 1957 HalH6 INVENTOR.

DRILL CHUCK WITH SPRING-LOADED COLLET 7 Howard Vermette, Hammond, Ind.

Original application April 2, 1957, Serial No. 650,234,

now Patent No. 2,855,207, dated October 7, 1958. Divided and thisapplication January 24, 1958, Serial No. 711,005

12 Claims. (Cl. 279-58) My invention relates to improvements in drillchuck construction, and generally to that type of drill chuck or workholder construction which has work holding surfaces and adjusting meansfor moving said surfaces to a work holding position.

The principal object of the present invention is to provide a drillchuck having movable work holding surfaces, adjusting means for movingthe same, and spring mechanism associated therewith in such manner thatthrough the spring action a pounding or hammer action is obtained toloosen the hold of the work holding surfaces on a drill bit or othertool being held therebetween.

This application is a division of my co-pending application for patenton improvements in Chuck Construction, Serial No. 650,234, filed April2, 1957, now Patent No. 2,855,207.

For a more comprehensive understanding of the construction abovereferred to and its operation, reference is had to the accompanyingdrawings, upon which:

Fig. 1 is a vertical sectional view of a drill chuck or collet embodyingmy invention; and

Fig. 2 is a plan sectional view thereof taken on the line 22 of Fig. 1.

In Figs. 1 and 2, I have shown the usual type of drill chuck, wherein achuck body 120 which has a tapered inner bore 122 receives therein aplurality of chuck jaws 124. These jaws are usually fastened at theirtop end in a holder 126 so that they are moved in an up and downdirection simultaneously. The chuck jaws 124 may have tapered outersides 125 and parallel work engaging surfaces 127 to grip the stem of adrill bit or other work tool. The chuck body or collet 120 is tapped at128 to receive the screw-threaded drive stem 130 which, as it is turnedup or down in the tapped opening 128, opens or closes the jaws 124 ofthe drill chuck by movement of the outer sides 125 against the taperedinner bore 122.

Means for elfecting a rotation of the collet or chuck body 120 includesa hand wheel or collar 132 in the shape of a cylindrical shell that hasparallel upper and lower ledges 134 and 136 for enclosing a coiledspring 138, and is telescopically mounted around the chuck body 120. Apair of spring retainer rings 119 and 121 mounted in parallel grooves117 and 115 adjacent the top and bottom of the chuck body hold the handwheel on the chuck body.

One end 140 of the spring 138 may be fastened in the chuck body orcollet 120 and then be coiled about the same the hand wheel 132 and haveits opposite end 142 fastened in the hand Wheel 132. I provide a pair ofengaging lugs or dogs 144 and 146, the dog 144 being mounted in thesurface of the chuck body 120 and the dog 146 being mounted in the innerwall of the hand wheel 132.

Thus as shown in Fig. 2, when the hand wheel is turned clockwise toapproximately 360 to create tension in the spring 138 and is thenreleased, the hand wheel will swing around counter-clockwise and thehammer lug or dog United States Patent 0 i 7 2,896,957. Patented July28, 1959 2 r 146 will strike the dog 144 with the impact of thecentrifugal action, eflecting a prompt loosening of the chuck body orcollet on the drill chuck jaws, thereby quickly releasing drill bits orother tools that are being held therein.

While I have illustrated and described a specific embodiment of theinvention, it will be apparent to those skilled in the art that changesand modifications may be made in the exact details shown and I do notwish to be limited in any particular; rather what I desire to secure andprotect by Letters Patent of the United States is:

1. A drill chuck of the type having a collet and movable jaws therein,said collet capable of rotation to separate or bring said jaws togetherin a tool holding opera tion, and a hand wheel mounted on said collet, aspring motor connected between said hand wheel and collet andcooperating dogs on said hand wheel and collet for effecting a hammeraction on said collet whenever said spring motor is loaded and released.

2. A drill chuck of the type having a cylindrical collet having atapered axial bore and movable jaws therein, said collet capable ofrotation to separate or bring said jaws together in a tool holdingoperation, and a hand wheel mounted on said collet, said hand wheelsurrounding said collet and enclosing a coiled spring, one end of saidspring connected to said collet and one end to said hand wheel, andcooperating dogs on said hand wheel and collet for effecting a hammeraction on said collet whenever said spring is coiled and released.

3. A chuck of the type having a collet and movable jaws therein, saidcollet capable of rotation to separate or bring said jaws together in atool holding operation, and a hand Wheel mounted on said collet, aspring motor connected between said hand wheel and collet and cooperating dogs on said hand wheel and collet for effecting a hammeraction on said collet whenever said spring mo-' tor is loaded andreleased.

4. A drill chuck comprising a cylindrical chuck body having a taperedinner bore, a jaw holder, a plurality of tapered jaws connected at theirtop end to said holder, said holder and jaws mounted in said taperedinner bore with the sides of said jaws against said tapered inner bore,a drive stern screw-threadedly mounted in a tapped bore in the top ofsaid chuck body, said drive stem having a bottom shoulder engaging thetop of said jaw holder to move said jaw holder and jaws down andtogether to grasp a drill bit when said chuck body is turned up on saiddrive stem, a cylindrical shell around said chuck body, and spring meansin said shell for loosening said jaws from grasping said drill bit, saidspring means coiled around said chuck body and having one end connectedto said shell and the other end to said chuck body.

5. A drill chuck comprising a cylindrical chuck body having a taperedinner bore, a jaw holder, a plurality of tapered jaws connected at theirtop end to said holder, said holder and jaws mounted in said taperedinner bore with the sides of said jaws against said tapered inner bore,a drive stem screw-threadedly mounted in a tapped bore in the top ofsaid chuck body, said drive stem having a bottom shoulder engaging thetop of said jaw holder to move said jaw holder and jaws down andtogether to grasp a drill bit when said chuck body is turned up on saiddrive stem, and spring means for loosening said jaws from grasping saiddrill bit, said spring means including a band wheel telescopicallymounted on said chuck body, a coiled spring therein, one end fastened tosaid chuck body and one end fastened to said hand 6. A- drill chuckcomprising a cylindrical chuck body bore, a'drive ste'm'screw-threadedlymounted in a tapped bore in the top of said chuckbody,;said drivestem-having a bottom shoulder engaging the top of saidjaw holder to move said jaw holder and jaws down and together to graspadrill bit when said chuck body is turned up on said drive stem, andspring means for loosening said jaws from grasping saiddrill bit, saidspring means including a hand Wheel telescopically mounted on said chuckbody and a coiled spring therein, one end fastened to said chuck bodyand one end fastened to said hand wheel, said hand wheel rotatable onsaid, chuck body toload said spring and a hammer lug onsaid hand wheeland a dog 'on said chuck body, said hammer lug adapted to strike saiddog when said rotated hand wheel is released.

7. A drill chuck comprising a cylindrical chuck body having a taperedinner bore, a jaw holder, a plurality of tapered jaws connected at theirtop end to said'holder, said holder and jaws mounted in said taperedinner bore with the sides of said jaws against said tapered inner bore,a drive stem screw-threadedly mounted in a tapped bore in the top ofsaid chuck body, said drive stem having a bottom shoulder engaging thetop of said jaw holder to move said jaw holder and jaws down andtogether to grasp a drill .bit when said chuck body is turned up on saiddrive stem, and means for rotating said chuck body to loosen said jawsfrom grasping a drill bit, said means including a cylindrical collarrotatably mounted on said chuck body, a boss extending outward from saidchuck body and a hammer lug extending inwardly from said collar forstriking said boss to rotate said chuck body.

8. A drill chuck of the type having a collet and movable jaws thereinfor grasping the stem of a. drill bit, a collar surrounding said collet,hammer means between said collar and collet for loosening said jaws whensaid collar is rotated, and spring means in said collar for actuatingsaid hammer means.

9. In a drill chuck of the type'having a collet and tightening membersin the form of movable jaws therein, a spring actuated weight which maybe wound and released to impart a hammer blow'for releasing saidtightening members.

10. In a drill chuck of the type having a collet and a plurality'ofaxially movable work gripping members, a spring actuated weight whichmay be wound and released to impart a hammer blow to release saidgripping members from grasping a work piece. a a a 11. A chuck havingmovable jaws therein for grasping an object therebetween, a collarsurrounding said chuck, hammer means, means to actuate said hammer meansto open the jaws of said chuck by rotating said collar.

12. A chuck having a plurality of work gripping members movable inwardlytoward a common axis, said members adapted to be outwardly movable fromsaid common axis to release the same from gripping a workpiece and aspring actuated weight which may-be wound and released to impart ahammer blow for releasing said gripping members from grasping a workpiece.

References Cited in the file of this patent Axelsson Oct; 25, 1955

